The security options can be accessed for the repositories at
1. Code->Explorer
2. Select a repo form the Explorer
3. At the details of the repository, you should click to the name of the repository beside the explorer.
4. Select the Manage repositories… menu
Here you can configure the rights of each contributor groups and individual users for repositories and their branches. “Rewrite and destroy history (force push)” option shound be Allow or Inherited Allow to be able to force push.